Drop wire bar support



Dec, 6, 193.. 1. w. NOYES DROP WIRE BAR SUPPORT TFORNEY.

v INVENTOR. /EA 14/ Nora-5.

Filed Sept. 1, 1938 BY M Patented Dec. 6, 1938 UNITED STATE Ira DROP WIRE BAR SUPPORT Noyes, Hopedale, Mass., assignor to Draper Corporation, Hopedale, Mass, a corporation of Maine I 1 I Application September 1, 1938, Serial No. 227,921

The present invention pertains motions for 1ooms,and more particularly relates to supporting devices for the drop wire bars of such stop motions.

Warp stop motions of the type to which my invention appliescommonly include a pair of drop Wire bars, so-called, upon which drop wires are threaded. The drop wire bars are located inslots in a supporting bracket and are intended to be firmly clamped in such slots so as to be held against accidental displacement or tion: Prior drop wire bar supporting devices have failed to. perform this intended function satisfactorily because they have been so constructed that slightvariations in manufacture :of the parts would resultin the device holding only one of the bars and leaving the other bar engagement with the other bar means arranged to engage one clamping member and thereby force both members respective drop wire bars, whereby both such bars are firmly held against movement in the slots.

The foregoing and other objects tion are accomplished in the construction illustrated on the accompanying drawing, of which:

Fig. 1 is a plan view of part of a warp stop motion having the preferred embodiment of my invention applied thereto;

Fig. 2 is a view in cross-section taken approximately on line 2-2 of Fig. 1; and

Fig. 3 is a view in cross-section taken approximately on line 3--3 of Fig. 1.

The warp stop motion shown on the drawing includes the said preferred embodiment of my improved supporting means but is otherwise of an old and well-known construction. This old construction includes front and rear frame members I and 2, respectively, which extend widthwise of the loom and are adapted to be fixed with the loom frame (not shown). Other usual members include a rod 3 which extends widthwise of the loom beneath the warpsheet W for supporting the latter, and front and rear drop wire bars 4 and 5 which also extend widthwise of the loom but are located above the warp sheet. Drop 4 Claims. (01. 139-369) wires 6 of any suitable usual form are threaded upon the drop wire bars 4 and 5.

In the normal operation of the warp stop mo-. tion, the individual warp threads each pass through an aperture I in a drop wire whereby each thread holds one drop wire up in the position shown on the drawing. When any warp thread breaks, the drop wire 6 supported thereby will fall into engagement with any usual means, not shown, for effecting the stopping of the loom. The function of the drop wire bars 4 and 5 is merely to hold the drop wires 6 erect during normal operation of the loom and to support the drop wires after they have fallen upon breakage of warp threads. In effecting this purpose, the drop wire bars must pass through slots 8 in the drop wires and accordingly must be rather thin.

Thin drop wire bars such as bars 4 and 5 must be supported, intermediate their ends, against lateral bending or vibration and it is for'this purpose that my improved supporting means is provided. The preferred form of said'means in cludes a bracket 9 which may berormed from a to warp stop lateral vibrasubstantially in a vertical plane parallel to the warp threads, except that lugs It on the bracket are bent laterally to fit against the frame members I and 2. The lugs II] may be fixed to such frame members by bolts II as shown. A pair of slots I2 and I3 are provided in the upper edge of the bracket 9 for receiving the drop wire bars 4 and 5, respectively. The bars project out of the slots and appreciably above the upper edge of the bracket.

The preferred form of my improved means for clamping the drop wire bars 4 and 5 in the slots l2 and [3 includes two separate clamping members I4 and I5. The member I4 is movably mounted on the bracket 9 and is adapted to engage only one of the drop wire bars. The second member I5, is movably mounted on the first member, I4, and is adapted to engage only the other of the drop wire bars. To this end, the member I4 consists of an arm which is pivoted to the bracket 9 and the member I5 consists of an arm which is pivoted to the free end of the arm I4.

The pivot IB for arm I4 is located at one side of the bracket 9, i. e., to one side of the bars 4 and 5 rather than between the latter, and engages one end of the arm I4. This arm extends from pivot I6 upwardly and then lengthwise of the warp threads across and over or above the slots I2 and I3. The arm I4 preferably extends across both of said slots but is so shaped that it will not touch one of the drop wire bars (preferand suitable against their of the invenpiece of sheet metal. The bracket 5 is positioned tends over'b'oth slots l2'and l3 but:.is cut'outxat" H! on its lower edge, so that it will not touch the bar 4. The arm. l5 accordingly engages.

the top of bar 5 only. Since each of the clamping members or arms is freely movable and? each;

engages only one of the drop wire bars, engagement of each such member withits'respective drop wire bar is assured in spite of manufacturing variations in the size, shape and location of the various parts involved.

The present invention further providesmeans engaging one of the clamping members, such as members. l4 and I5, and constructed and ar-- ranged to force both of such members into clamp ing engagement with their respective drop wire bars. Saidmeans; preferably consists .of ascrew 2figdevicetsuchaas'that shown on the drawing. More.

specifically, the screw device shown consists of a threadedxrod I9 having a nut 2|] screwed thereon. 'I'he-ari'i'r- I4 is bowed at 2| to provide an opening between the arms. The rod l9 extends" vertically through; this opening. The lower end of the rod is pivoted in an aperture 22in the bracket!!! The arrangement is such-that the nut 20 engages:

theiupper-edgeof arm l5-andsdoes not touch the" arm- I.. Thus,.when the nut is tightenedit ex'-' erts downward .force' on the arm IS.

The rodrl9 and nut 20 are located atthe opposite side of the bars 4 and 5 from pivot 16; between-the bars'and pivot- IT. The said downward-force, even though applied directly only' to arm 15, will act on arm" ,H through arm l5 and the pivot IT. The nut'zli' is. manually releasable to permit removal orinsertion oi the drop wire bars;

The supporting means as thusdescribed is much moresatisfactory than prior supportingdevices because it firmly holds-bothdrop wire bars (which prior: rigid devices would not do) and'because it exerts a firmer grip on the bars andis. more sub stantial than prior-spring clampsdevised'for the same purpose. These advantages'are achieved.-

while retaining the simplicity andease 'ofroperation of a the single screw" device for clamping or.

releasing the drop-'wire-ba'rs.

Having fully disclosed the preferred embodiment of my invention, I claim:

1. A drop wire bar support comprising a bracket having a pair of slots in its upper edge for receiving the drop wire bars of a loom, a clamping member supported by said bracket and adapted to engage the top of one of said drop wire bars only, a second clamping member movably mounted'on the first saidmember' and adapted to engage the top of the other drop wire b'ar only, andimeans engaging one of said members for forcing both of said members into clamping engagement-with their respective drop wir-e bars.

2. Aidrop wire bar support comprising a bracket having a pair of? slots in its upper edge for receivingthe-dropwire bars of a loom, a clamping member pivoted to said bracket and adapted to engage the top-of 0ne.of:saicl drop wire bars only, a secondclamping member pivotally mounted on the first said member and adapted to engage the top: of the other drop'.. wire*bar only; and means engagingv the: said second. member. for forcing both of said members into clamping engagement with their respective drop wire bars..

3.- Adrop'wire bar 'support'comprisinga-bracket having a pair of slots'in'its .upper edge-forcre ceivingzthe drop wire. bars-of a loom, a clamping! member-comprisinganarm pivoted at one endito one siderof, said bracket, said: arm extending :over' said slots andzbeing arranged'torengage only one'i of said bars, a second: armupivoted'i to the .first saidarm andiarrangeditb engage: only the; other of' saidibars; and; a screw. device engaging said; second arm'only'and arrangedito" force both of: said armsinto clampingrengagement with their.

respective 'drop wire bars.-

4. A-drop wire bar :support: comprising a bracketi having a pair of slots in its upper edge for re; ceiving the drop-wire bars of atloom, aclamping arm" having:one end pivoted to said" brack'et and:

its other :end free; saidcarm extendingtover. both arm and arrangedtoengage'onl'y the other :offsaid bars-and aadeviceexerting downward pressure on: said second armsat-a :point' between:saidabarss and'.

the pivotof: said; second arm to. thereby'force both said: arms 'againstltheir respective :drop. wire:

bars.

IRA W; NOTES. 

